UM43 - Uniweld UM43 Harris Style Oxy-Acetylene Mixer for 43 Series Handles

Precision Gas Mixing for Professional Welding

The Uniweld UM43 Mixer Assembly is a high-performance component designed to facilitate the precise blending of oxygen and acetylene in oxy-fuel welding and heating operations. Engineered to meet the rigorous demands of industrial fabrication, this mixer is a direct replacement for mixers used with Harris-style 43 series torch handles, such as the Uniweld 43L9 or the Harris 43-2. By ensuring the gases are mixed at the correct ratios before reaching the tip, the UM43 enables a stable, neutral flame essential for producing strong, clean welds and efficient brazing.

Constructed from high-quality brass, the UM43 is built to resist the thermal expansion and contraction cycles common in heavy-duty welding environments. The durability of the material prevents warping and maintains the integrity of the gas passages over time. This mixer serves as the critical interface between the torch handle and the welding or heating tip, utilizing threaded connections that ensure a tight, leak-free seal. Proper gas mixing is vital not only for flame quality but also for safety, as it helps maintain positive pressure and reduces the likelihood of backfires when used with appropriate arrestors and check valves.

The design of the UM43 accommodates a variety of welding and heating tips, making it a versatile addition to any welder's toolkit. Whether you are performing structural welding, pipe brazing, or general maintenance repairs, this mixer provides the consistency required for professional results. It is specifically calibrated for oxy-acetylene applications, optimizing the fuel gas performance for maximum heat output and control.

Technical Compatibility

This assembly is designed to fit standard "43 style" handles. Users should verify that their torch handle utilizes the larger, heavy-duty connection style typical of the Harris 43 series, rather than the smaller aircraft-style handles. The UM43 integrates seamlessly with Uniweld's product line as well as compatible aftermarket parts, ensuring broad usability across different equipment setups.